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SECONDARY   COCKPIT   LIGHTS   OPERATIONAL   CHECK
INSTR   FLOOD   LIGHTING   CIRCUIT   BREAKER   WILL   NOT   STAY   CLOSED

TM-55-1520-240-T-2 CH-47D Heilcopter Manual
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TM    55-1520-240-T 9-13.12   SECONDARY   COCKPIT   LIGHTS   OPERATIONAL   CHECK   (Continued) 9 - 1 3 . 12 TASK RESULT 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Check  that  INSTR   FLOOD   LIGHTING   cir- cuit  breaker  (1)   is closed. Check  that  DC  BUS  CONT  NO.  1  circuit breaker  (2)   is closed. Check  that  CKPT  DIM  CONT  LIGHTING circuit  breaker  (3)   is closed. Set  PLT  INST  lights  control  (4)  to  DIM. Set  INST  and  OVHD  FLOOD  lights switches  (5  and  6)  to  ON. Turn   FLOOD   lights   control   (7)   from   OFF through  DIM  to  BRT. Set   INST   FLOOD   lights   switch   (5)   to   OFF. Set  OVHD  FLOOD  lights  switch  (6)  to OFF. Open   NO.   1   DC   BUS   CONT   circuit   breaker (2). Turn   PLT   INST   lights   control   (4)   to   OFF. Close   NO.   1   DC   BUS   CONT   circuit   breaker (2). If  circuit  breaker  (1)  is  open,  close  it.  If  it  opens again,  go  to  task  9-13.13. If  circuit  breaker  (2)  is  open,  close  it.  If  it  opens again,  go  to  task  9-13.5. If  circuit  breaker  (3)  is  open,  close  it.  If  it  opens again,  go  to  task  9-13.14. Eight  flood  lights,  six  on  instrument  panel  and  two behind  pilot’s  seat  shall  come  on  dim  and  then  in- crease  in  brightness.  If  flood  lights  do  not  come  on, go  to  task  9-13.15.  If  flood  lights  do  not  increase  in brightness,  replace  FLOOD  lights  control  (7). Six  flood  lights  on  instrument  panel  shall  go  out.  If flood  lights  do  not  go  out,  replace  switch  (5). Two   flood   lights   behind   pilot’s   and   copilot’s   seat shall  go  out.  If  flood  lights  do  not  go  out,  replace switch   (6). All  eight  flood  lights  shall  come  on.  If  not,  go  to  task 9-13.16. Flood  lights  and  indicator  lights  shall  go  out.  If  not, replace  PLT  INST  lights  control  (4). FOLLOW-ON    MAINTENANCE: TM    55-1520-240-23: Battery  Disconnected Electrical  Power  Off Hydraulic  Power  Off END  OF  TASK Change  2 9-246.3







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